Lectrosonics DM812 - Manual (Page 8)

DM Series Installation Guide
LECTROSONICS, INC. 8
Programmable Inputs
Programmable inputs are provided to enable external
control over a variety of parameters. Each input can
respond to either a contact closure or a continuous
voltage. The following illustrates common connections
to the programmable input pins. (See also Program-
mable Inputs and Outputs Wiring Diagram.)
10K Linear Potentiometer
CCW CW
+5V
To Programmable Input Pin
Gnd
Contact Closure as Programmable Input
To Programmable Input Pin
Gnd
DC Voltage Source as Programmable Input
To Programmable Input Pin
0VDC (Off) to +5VDC (On)
Gnd
Potentiometer Connection for
Analog Control of Gain
No external pull-up resistors are necessary because
each programmable input is internally pulled up through
a 100K resistor to +5V. When using a continuous volt-
age with one of the programmable inputs, the function
of the programmable input must be set to either Analog
In Control or Analog Out Control on the Program-
mable Inputs control tab in the Control Panel GUI.
See the Programmable Input tab in the Control Panel
software Help for setting all programmable input param-
eters.
Programmable Inputs and
Outputs (DM1612F shown)
Programmable Outputs
Programmable outputs are used to indicate either
channel activity or the current state of a programmable
output. Each programmable output is the electrical
equivalent of a contact closure to ground. When a
programmable output is “active”, it conducts current to
ground. When the programmable output is “inactive”,
no current flows to ground. The maximum usable volt-
age for the programmable outputs is 40 V and they will
safely conduct up to 100 mA DC continuous. Following
are some typical uses for the programmable outputs.
Note: The diagram shows an external DC source
powering the relay coil. This is necessary
whenever coil voltages exceed 5 V.
Both LEDs and 5V relay coils can be powered by the
+5 V DC pins on the programmable input connector, as
long as the maximum combined current for all LEDS
and relay coils does not exceed 100 mA.
Programmable Input/Outputs Connections
Looking at the male connector on the rear panel of the
processor, the pinouts are as follows:
LED is on when the programmable output is active
380 Ohms
Programmable Output Pin
380 Ohms
LED is off when the programmable output is active
Programmable Output Pin
Gnd (from Programmable I/O
Pins 1, 8, 13)
1N4001
or equiv. External
DC Voltage
Source
(<40VDC) Relay Coil
Coil current <100mA
Programmable Output Pin
Gnd (from Programmable I/O
Pins 1, 8, 13)
Relay is on when the programmable output is active
+5VDC (from Programmable I/O
Pins 14, 20, 25)
+5VDC (from Programmable I/O
Pins 14, 20, 25)
Expansion I/O ports
The four RJ45 connectors on the rear panel are used
to interconnect LecNet2™ units together. These ports
are only used to transfer digital audio information via
the Digital Audio Network Interface (DANI) between the
units.
Expansion I/O Ports
(DM1612F shown)